<?php
class Des_Crypt {
     private $key;
     
     function __construct($key) {
         $this->key = $key;
     }

     function encrypt($string) {
         $size = mcrypt_get_block_size('des', 'ecb');
        // $string = mb_convert_encoding($string, 'GBK', 'UTF-8');
         $string = $this->pkcs5_pad($string, $size);
         $key = $this->key;
         $td = mcrypt_module_open('des', '', 'ecb', '');

         $iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);

         @mcrypt_generic_init($td, $key, $iv);
         $data = mcrypt_generic($td, $string);
         mcrypt_generic_deinit($td);
         mcrypt_module_close($td);
         $data = base64_encode($data);
         return $data;
     }

     function decrypt($string) {
         $string = base64_decode($string);
         $key =$this->key;
         $td = mcrypt_module_open('des','','ecb','');
         //MCRYPT_DES,cbc
         $iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
         $ks = mcrypt_enc_get_key_size($td);
         @mcrypt_generic_init($td, $key, $iv);

         //
         $decrypted = mdecrypt_generic($td, $string);

         //
         mcrypt_generic_deinit($td);
         //
         mcrypt_module_close($td);

         $result = $this->pkcs5_unpad($decrypted);
        // $result = mb_convert_encoding($result, 'UTF-8', 'GBK');
         return $result;
     }

     function pkcs5_pad ($text, $blocksize) {
         $pad = $blocksize - (strlen($text) % $blocksize);
         return $text . str_repeat(chr($pad), $pad);
     }

     function pkcs5_unpad($text) {
         $pad = ord($text{strlen($text)-1});
         if ($pad > strlen($text)) {
             return false;
         }

         if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) {
             return false;
         }

         return substr($text, 0, -1 * $pad);
     }
 }
/*
 $key = "123456";
 $string1 = "lina||vigo||60.191.34.147||3478";
 $string2 = "";
 $des = new Des_Crypt($key);
 $encryption = $des->encrypt($string1);
 $decryption = $des->decrypt($encryption);
 echo "".$decryption;
 echo "<br />";
 echo "".$encryption;
 */
 ?>
